Answer:

Step-by-step explanation:
Set an equation:

Combine like terms:

Add 5 to both sides:

Divide both sides by 2:


The storage tank one is 14.99
Half cylinder is 471.239
I don't remember how to do the second one sorry :(
Answer:
Step-by-step explanation:
Given:
Length of ladder, y = 10 ft
θ = π/3 rad
Using cosine rule,
Sin θ = opposite/hypotenuse
Sin θ = x/y
Sin θ = x/10
Differentiating both sides with respect to dθ,
10 × cos θ × dθ = dx
10 cos θ = dx/dθ
dx/dθ = 10 × cos π/3
= 5 ft/radians.